split ComposerService out of SurfaceComposerClient.h

Change-Id: I1eb691f7ca263d5895d871ab675bb5826e0323c6
diff --git a/libs/gui/tests/Surface_test.cpp b/libs/gui/tests/Surface_test.cpp
index 693b7b8..ea52750 100644
--- a/libs/gui/tests/Surface_test.cpp
+++ b/libs/gui/tests/Surface_test.cpp
@@ -22,6 +22,8 @@
 #include <surfaceflinger/SurfaceComposerClient.h>
 #include <utils/String8.h>
 
+#include <private/gui/ComposerService.h>
+
 namespace android {
 
 class SurfaceTest : public ::testing::Test {